Pivot table -during the load

[#1]

Incoming data looks like below

VBELN	MATNR	Bill.Date	QTY
101	XX1	1/3/2012	10
102	XX1	1/5/2012	5
103	YYY	1/4/2012	5
104	YYY	1/6/2012	20
105	XX1	2/2/2012	50
106	XX1	2/28/2012	3
107	YYY	2/25/2012	2
108	XX1	3/3/2012	9
109	YYY	3/3/2012	10
110	XX1	3/19/2012	6

Expecting Results - during the time of the dataload (script)

MATNR	Jan-12	Feb-12	Mar-12
XX1	15	53	19
YYY	25	2	10

We can do like this in the pivot table.The problem is -I have to  add additional few columns after Mar-12.

Pivot table will not work. Is there any better way to  handle  in the script.(Millions of record in the table).

Advance Thanks for your help.

[Anonymous]

It will be:

data:
LOAD
   MATNR,
   date(monthstart("Bill.Date"), 'MMM-YY') as Month,
   sum(QTY) as QTY
FROM <your file>
GROUP BY MATNR, monthstart("Bill.Date");

Regards,
Michael
PS: it will be a little different if you load from a database, but the logic is the same.